My sister hated the new programs, but loved the old systems because the 
OPTIONS:
- programs were horrible.
- systems were horrible.
programs were horrible.

Erin seems to think owning guns is somehow necessary whereas Kayla knows that is not the case in a civilized society since 
OPTIONS:
- Erin is intelligent.
- Kayla is intelligent.
Kayla is intelligent.

Mary had a better body and was more of a showoff than Emily. 
OPTIONS:
- Mary hates wearing bikinis to the beach.
- Emily hates wearing bikinis to the beach.

Emily hates wearing bikinis to the beach.